What is the equation for the line of best fit?

Radii ok and nl are perpendicular to om because of the radius-tangent theorem. by definition of perpendicular, angles kom and lnm are right angles. this means that triangles kom and lnm are right triangles. angle lmn is common to both right triangles, so by the triangles kom and lnm are similar.

Find the value of x for which line a is parallel to line b

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.